hi i am new to this so dont take my advise seriously
srart with
18 int
16 con
18 dex
14 or so wis
and as much str with the rest of the points
dont bother with Chr just use the ring in the circus area
Magic missiles are a must and maybe a few attack spells like fireball lightning and the such, armor, invisible, dispell, and whatever you want
* assuming that you dont pick a specialist*
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I am Demoquin, Agent from Hell